The first demonstration of acousto-optical excision using a GaAs
photodetector array is reported. A maximum isolation of 40 dB was obtained
using a six element GaAs interdigitated finger double heterojunction
photo conductor array. The center frequency was 45 MHz, and the
swept bandwidth was 6 MHz. The response of discrete GaAs heterojunction
photo conductors was linear with bias voltage, potentially making
them useful for performing multiplication functions in optical analog filters.
New concepts of using these photo conductors for optical adaptive
filters are presented.